A firewall is a kind of valve: it's easy to get out (on the internet), but hard to get in.
The firewall is one or more programs on a computer, that's also a node between intranet and internet. All packages going through are checked. Some of the packages are discarded. A typical rule for checking is to check which porst are allowed.
A rule of thumb: a firewall starts as closed, and has to be opened to allow the necessary access.
Concept last updated: 15/09 2003.
- Informationsteknologi B til HH; 1.udgave; Peter Zangenberg, JPJ, FDM (obl.) - 9. Virksomhedens sikkerhedsstrategi og -politik
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